I assume you're referring to the monster special abilities table and not to the AC/HP/Damage "Quick Create" table, right? The Quick Create table isn't egregiously bad, in the sense that if you created monsters using that table and gave them all ranged attacks, your players would probably find the resulting encounters more challenging than fights with MM meatsacks (as opposed to the MM non-meatsacks like Intellect Devourers and drow). However, the rest of the system including the special abilities table is totally insane. Teleport has zero effect on CR? Avoidance is like +1 to AC? I guarantee you that if I run four 7th level PCs through two "Medium" encounters, one with 14 bog-standard orcs and one with 14 teleporting orcs with only AC 12 but with Avoidance, they will notice that the second encounter is noticeably harder. In fact, technically I can give the magic orcs 25 HP and a Legendary Resistance without moving them out of their CR 1/2 bracket (which brings us back to the Quick Create table, which is quite bad in some places but not egregiously bad overall).
The CR construction rules are whacked, best used for calculating kill XP and nothing much else. Don't expect CR to equate to deadliness in the general case.